add meta-app-framework to meta-agl

add meta-app-framework to meta-agl

meta-app-framework is a layer containing the AGL App Framework recipes

4 new layers are added for application framework:
* meta-intel-iot-security/meta-security-smack
* meta-intel-iot-security/meta-security-framework
* meta-agl/meta-agl-security
* meta-agl/meta-app-framework

In the templates files, the following changes were done:
* activation of Smack and Cynara
* modify the tar command to be used to support Smack extended attributes

Change-Id: If369221ca7614fe0072f2a0f99a5051ef2af831d
Signed-off-by: Stephane Desneux <stephane.desneux@iot.bzh>